Here is the full list of all 28 Foul Play - there are Yuri Visual Novel achievements.
Beginning main character's journey
Break Winter's heart more than 3 times.
Break Cynthia's heart more than 3 times
Go on a fancy date with Winter. Try the pão de queijo
Ending a game by focusing on yourself and not dating anyone
U-Haul with Cynthia, who you've dated for less than one month
Date both Winter and Cynthia
Reach 100% on Cynthia's romance bar
Reach 100% on Winter's romance bar
Kiss Cynthia but you're still not sure if she likes you
Kiss Winter. You'll need a bucket for all these red flags
Spicy times with Cynthia
Spicy times with Winter
Answer most detective questions correctly
Answer most detective questions incorrectly
Play entire game with hints off
You realize you're gay. It's a long journey ahead of you, buddy.
There's always that one lesbian who is obsessed with astrology.
You picked the wrong choice, and Cynthia suffered the consequences.
Winter doesn't like detectives... alive.
You didn't arrest Winter when you had the chance. RIP.
You failed Raeni's test.
Cynthia shoots Winter
Runaway with Winter ending
Start a new career by working for Raeni
Learn about Winter's past
Collect all phone notes on Cynthia & Winter
Your happy little horse packs a punch